from tornado.web import RequestHandler
from tornado.ioloop import IOLoop

class MainHandler(RequestHandler):
    def get(self):
        self.write("Hello from Tornado!")

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ])

if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
    IOLoop.current().start()